Re: "magic brackets" in GNUmeric



We are not supposed to have anything like magic brackets.
We don't even have code for it.

Could you please file a bug for this at bugzilla.gnome.org with a test
sheet?

What exactly is the "GNUmeric portable app version"?

Thanks,

Morten



On Wed, Mar 26, 2014 at 9:35 AM, Schorsch MCMLX <schorsch_mcmlx yahoo de> wrote:
Dear list,

I've just discovered that GNUmeric 1.12.9 running as a portable
application on my Win7x64Prof shows the same "uncanny powers of
parentheses" (W. Kahan) as Excel does. For example, if n>0, x(n) =
1/2^n, y(n) = 1- x(n), and z(n) = 1- y(n), then calculations in
IEEE754 DP mode should yield z(n) = x(n) up to n = 53. This holds true
in case of GNUmeric 1.12.6, which is the version shipping with my
Ubuntu 13.10 x64. On the contrary, the GNUmeric portable app version
1.12.9 running on my Win7x64Prof yields z(n) = 0 for n>=50, and this
is exactly equal to what XL14x64 gives me. Enclosing this difference
in parentheses, i.e. defining z_p(n) = (1-y(n)), yields z_p(n) = x(n)
for n <= 53, again exactly mimicking XL's output. I checked this using
the newly implemented hexrep function, many thanks to the developer(s)
for implementing it!!

In case somebody besides me likes the output of hexrep to show up in
big endian byte order with spaces between the bytes on a little endian
machine, here is my "trick":
enter =upper(hexrep(some_value)) in cell XY, and
=right(XY,2)&" "&mid(XY,13,2)&" "&mid(XY,11,2)&" "&mid(XY,9,2)&"
"&mid(XY,7,2)&" "&mid(XY,5,2)&" "&mid(XY,3,2)&" "&left(XY,2)
in the cell where you want the "pretty print" version of hexrep to
show up.

So my question is whether introducing these "magic brackets" on Win
happens because GNUmeric calls some Win dlls, or wether it has been
explicitly added in order to exactly mimic XL?

FYI: all forks of openoffice I managed to get my hands on yield the
correct result for n <= 48  only, and do not implement "magic
brackets".

All the best
Schorsch

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